Potato Cream Filling

1/2 c Butter

1 c Potatoes, mashed

1/4 c Cream cheese

1/3 c Sugar

1/4 c Sour cream

1 ts Orange rind, grated

3 Egg yolks

1 ts Lemon rind, grated

1 ts Vanilla

Cream butter until soft. Beat in mashed potatoes and cream cheese. Stir in remaining ingredients.